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EFI Tuning Guide – 7.34
Miscellaneous Tuning
Warmup Enrichment
The Warmup Enrichment Table, located in the Advanced Tuning Mode, tells the ECM how
much Additional Fuel, (indicated as AFR of enrichment) the front and rear cylinders should
receive to properly run an engine that’s warming up.
When the ignition is first turned on the ECM checks engine temperature one time to
determine where in the Warmup Enrichment Table it should start. When the engine is started
the Warmup Enrichment affect “decays”, or diminishes over a set period of time until it
reaches zero, or no effect. The “Decay Time” is time-based, not “table-based”.
Any changes made to the Warmup Enrichment table increase or decrease the amount of fuel
delivered while the Warmup Enrichment mode is in effect. Changes to the Warmup
Enrichment Table will not affect how long the Warmup Enrichment period lasts.
Use this Tuning Table to increase or decrease the fuel for a cold engine that’s warming up so
that it runs properly.
► If engine coughs, or dies, or hesitates, or surges when running in the warmup mode –
increment the Warmup Enrichment cells to increase the amount of fuel enrichment.
► If engine sputters, or blows excessive black smoke, or fouls spark plugs when
running in the warmup mode – decrement the Warmup Enrichment cells to decrease
the amount of fuel enrichment
► Use data recordings and the Data Mode program to identify what engine temperature
the problem is located in.
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